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st: repeated factor ANOVA
From
James prince <jsprince26@gmail.com>
To
statalist@hsphsun2.harvard.edu
Subject
st: repeated factor ANOVA
Date
Tue, 2 Oct 2012 07:57:07 -0500
Hello,
I am unsure how to set-up the following problem using the ANOVA
command. Any help would be appreciated.
I have data on 600 liver patients, 300 assigned to one of two
treatment groups (TREAT).
Each had 4 biopsy (one in each quadrant: UR, UL, LR, LL) and the
concentration on an enzyme (Y) measured. I also have data for sex. I
know that I can used XTMIXED to do this, but I need to use ANOVA
Thank you in advance,
Jim
--------------------------------------------------------------------------------------
This is what I did: I first tried using a repeated ANOVA but got an error:
. anova y treat liver sex subj, repeat(subj)
could not determine between-subject error term; use bse() option
Then,
If I set it up as nested, I get a result, but I am not sure if it is correct.
anova y treat liver sex/ subj|liver/
Number of obs = 696 R-squared = 0.7757
Root MSE = 2.7219 Adj R-squared = 0.5508
Source | Partial SS df MS F Prob > F
-----------+----------------------------------------------------
Model | 8892.14113 348 25.5521297 3.45 0.0000
|
treat | .032965724 1 .032965724 0.00 0.9670
liver | 2235.41594 3 745.138647 38.76 0.0000
sex | .048400013 1 .048400013 0.00 0.9600
subj|liver | 6593.27098 343 19.2223644
-----------+----------------------------------------------------
subj|liver | 6593.27098 343 19.2223644 2.59 0.0000
|
Residual | 2570.83017 347 7.40873248
-----------+----------------------------------------------------
Total | 11462.9713 695 16.4934839
--------------------------------------------------------------------------------------------------------------
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